JPH04131407A - Method for repairing area around manhole or the like area - Google Patents

Abstract

PURPOSE:To carry out a sustaining repair by excavating pavement around an existing manhole, fixing by cement concrete mixture, and performing surface treatment with a bituminous emulsion mixture using coarse-particle aggregate/ fine-particle aggregate for integration. CONSTITUTION:A manhole 2 is installed on existing bituminous pavement 1 and supported by a metallic support 5 via annular adjusting concrete 4 at the upper portion of manhole. A manhole cover 6 is installed on the support 5 in such a manner the cover can be freely opened and closed. The bituminous pavement around the manhole is excavated by a breaker or the like, and cement concrete 8 is placed in the excavating portion 7 to a level lower than the height of manhole 2. Then, a bituminous emulsion mixture 9 using coarse-particle aggregate is placed to the height of manhole 2. Above its surface and around it, a surface treatment surface is formed with a bituminous emulsion mixture using fine-particle aggregate, so that the repaired portion and the manhole 2 are solidified integrally. Thus, repair can be made durably in a short time at room temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a repair method for areas around manholes, etc. More specifically, it relates to a durable repair method for areas around manholes that does not require repeated repairs.

[Prior art]

On paved surfaces such as roads, especially in urban areas,
Due to a combination of various conditions such as road environment, width of width, large vehicle traffic volume, overloaded large traffic, parking on the road, and excavation for underground structures, manholes and other road-occupied objects can cause damage to the surrounding road surface. Due to subsidence, flow, or damage, it protrudes from the road surface, and bumps are likely to occur there. When a level difference occurs around a manhole or the like, it becomes a major cause of traffic obstruction and traffic accidents, and the surrounding pavement is likely to be destroyed. In addition, the manhole itself may rattle, and there is a risk that the conditioned concrete layer located below and the manhole itself may be damaged. Furthermore, in cold, snowy regions, the shovel blade of a snowplow may collide with a step during snow removal work, which may result in personal injury or damage to the snow removal machine.

Therefore, the difference in level around road-occupied objects such as manholes,
It always needs to be repaired. Conventionally, for repairs, the area around the manhole was excavated and removed and the area was completely filled with heated asphalt mixture. Also, is there aggregate and bituminous emulsion in the stepped area? Another method used was to alternately spread and compact the material.

[Problem to be solved by the invention]

However, the heated asphalt mixture used as a repair material cools down quickly, especially in winter, and when water drips, steam is released, making it impossible to obtain a dense finish. Because it is easy to repair, it will not last long even if it is repaired, and the same part will be worn out or damaged, and there will be a difference in level. This results in the problem of having to be repeatedly repaired. Also, care must be taken when handling heated asphalt mixtures to avoid burns. Furthermore, the heated asphalt mixture cannot be used once it has cooled, so it must be kept warm during transportation and must be applied while it is still hot. Therefore, it is difficult to perform construction unless the site is of a relatively large scale, and there is a problem in using it for repairing steps, etc., as there is a large loss of material.

In addition, the method of alternately spraying aggregate and limestone emulsion on uneven areas and flattening them by compaction tends to cause the aggregate to scatter.
There are also problems such as the construction being too time consuming.

In addition, the increase in traffic volume in metropolitan areas is subject to constraints on the construction time of pavement repair work and the time of traffic closures.
There is a strong need for the development of a durable repair method that can be applied at room temperature, has good workability, can be opened to traffic quickly, and does not require repeated repairs.

[Means to solve all problems]

The present invention meets these demands by excavating and removing the pavement around manholes, then completely pouring a cement-concrete mixture in the removed area, and then completely paving and shaping a bitumen emulsion mixture on top of it. By doing so, we provide all methods for repairing the existing pavement, the repaired area, the manhole area, etc. by integrating and hardening the area around the manhole.

That is, in the present invention, the pavement around the existing manhole is excavated and removed, a cement comfort mixture is poured into the removed area at a level lower than the height of the entire manhole to completely fix the manhole, and then coarse-grained aggregate is poured into the removed area. The bituminous emulsion mixture used was paved and shaped to the height of the manhole, and the entire surface treatment layer was treated with a bituminous emulsion mixture using fine-grained aggregate, including the upper surface of the manhole and a part of the upper surface of the existing pavement. The gist of this work is a repair method for the area around manholes, which is characterized by integrating and solidifying the existing pavement, the repaired area, and the manhole.

According to the present invention, the wobbling of the manhole receiving frame due to the level difference that occurs around the manhole can be fixed by pouring a cement-concrete mixture all over the area where the pavement around the manhole has been excavated and removed. Is it possible to obtain about 10 times the strength of asphalt mixture and prevent the rattling of manholes? It can be eliminated. As the cement used here, in order to shorten the repair work time, it is preferable to use a super fast hardening type jet cement which will be described later.

Further, according to the invention, by applying a bituminous emulsion mixture on the top surface of the poured cement-concrete mixture layer, evaporation of water from the cement-concrete mixture is prevented and its hardening is prevented. It can easily prevent initial cracking, develop initial strength, and prevent freezing.

Furthermore, according to the present invention, the surface of the repaired part and the surface of the existing pavement adjacent thereto are treated with a layer of the emulsion mixture including gold. By applying this method, the existing pavement, the repaired part, the manhole, etc. are integrated, and the entire repaired part around the manhole can be used for traffic in a short period of time, and is durable and has no steps. be able to.

The cement-concrete mixture as used in the present invention is composed of cement, cement admixture, aggregate, water, etc.

Examples of cement include ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, moderate heat Portland cement, white Portland cement, blast furnace cement, silica cement, fly ash cement, alumina cement, expansive cement, and sulfuric acid resistant cement. Chilled with salt cement, jet cement, blast furnace colloid cement, colloid cement, etc. These can be used alone or in combination, but as mentioned above, in order to shorten the total repair work time, dient cement is used in particular. It is preferable to use In addition to these cements, admixtures such as cement shrinkage compensators, hardening accelerators,
A curing retardant, an AE agent, a dispersant, a thickener, a water reducing agent, a foaming agent, a decolorizing agent, etc. can all be used in combination.

Cement concrete can also be manufactured by adding asphalt emulsion, rubber asphalt emulsion, SBR latex, EVA latex, acrylic latex, etc. as an additive to cement.

General gravel, sand, etc. are used as aggregate. It is preferable that the size of the gravel is 25 cm or less.

Further, powdered rubber, powdered resin, organic fibers, steel fibers, etc. can all be used as aggregates.

An example of a cement-concrete mixture formulation? If shown, it is the same as Table 1.

Table-1 Is the above combination example a guideline? The formulation may be changed at any time depending on the site conditions.

In the present invention, the bitumen emulsion mixture using coarse-grained aggregate and fine-grained aggregate refers to aggregate in which the aggregate component is cement or lime mixed in an amount of 4% by weight or less, or aggregates, fillers, etc. The maximum particle size of aggregate is 2 for coarse aggregate.
0 m'! fc is 13 or less, and 5 for fine aggregate. , or less, in any case 0-074 mm
The amount passing through the sieve is 4 to 20% by weight, and it is produced by mixing a predetermined amount of the aggregate component with a required amount of bitumen emulsion necessary to bind the predetermined amount of the aggregate component, A fast-setting bituminous emulsion mixture with slump properties is desirable.

As disclosed in JP-A-1-250505, this engineered blue emulsion mixture is prepared by dividing a predetermined amount of the aggregate component and a predetermined amount of the blue emulsion into containers such as packs (for example, commercial products). If you mix this at all repair sites,
It is useful because it is extremely easy to manufacture.

The cement used is the one mentioned above, and the lime used is usually powdered slaked lime, such as slaked lime or quicklime.

As the aggregate, aggregates commonly used for asphalt pavement are used. For example, crushed stone, crusher run, screening, crushed stone dust, slag, sized crushed stone, sand, etc. In addition, light colored aggregates and hard aggregates can also be used. Dry aggregates are used for these aggregates.

In addition to so-called stone powder, the filler can include carbonate lime powder, water and sewage sludge incineration ash, cement, fly ash, slaked lime, diatom, talc, clay, volcanic ash, glass powder, and other metals.

In addition, the reason why cementum or lime is used at less than 4% by weight in the aggregate components is because if the content exceeds 4% by weight, the adhesion to the aggregate components will decrease when the bitumen emulsion decomposes. .

Further, when the bitumen emulsion mixture is hardened, if the ratio of cement, etc. to the bitumen is high, the flexibility will be reduced. Furthermore, the reason why no lower limit has been set is that depending on the filler that is added to the aggregate components, it may be possible to avoid adding cement and other materials altogether. For example, it is better to use water sewage sludge incineration ash, which contains a large amount of slaked lime, for gold filler.

The amount of the aggregate component passing through the 0.074-sieve is 4 to 20% by weight, preferably 5 to 16% by weight. When the amount of bituminous emulsion (hereinafter referred to as "mixture") is less than 4% by weight, it is not possible to add the necessary amount of bitumen emulsion to bind the aggregate components, and the bituminous emulsion mixture produced (hereinafter referred to as "mixture") becomes dry. Syslump properties cannot be obtained, resulting in poor workability. Furthermore, since there are many voids in the mixture and the amount of binder is reduced, the wear resistance and durability of the mixture are reduced. Also, if the filler content exceeds 20% by weight, the amount of green emulsion mixed with the aggregate component may be too large.
The curing shrinkage of the mixture after paving increases. In addition, the stability decreases and it becomes easy to flow, and furthermore, there is a risk that the e-yoi material will flash in the summer. A typical example of the particle size of aggregate components is shown in Table 2.

Table 2 Particle Size of Aggregate Components The bitumen emulsion used in the present invention is a bituminous material such as natural asphalt, straight asphalt, flown asphalt, semi-prone asphalt, solvent-stripped asphalt (e.g. propane film asphalt), tar, pitch, etc. or a mixture of two or more of these? Modified bituminous material that is heated and melted and then mixed with rubber and resin?
It is an oil-in-water type bituminous emulsion emulsified in water by appropriately using emulsifiers, dispersants, stabilizers, etc. Generally, a bituminous emulsion is used, which is a complete emulsion of asphalt mainly consisting of straight asphalt, straight asphalt hi rubber, modified asphalt modified with resin, etc. Depending on the type of emulsifier (surfactant) used for emulsification, there are
Types of bituminous emulsion such as nonionic, anionic, cationic, claytaive, etc. are known, but the bitumen emulsion used in the present invention is cationic or anionic, and has good miscibility with aggregate components, and after mixing. A type that quickly decomposes after the entire time necessary to ensure full workability of the mixture is used.

The bitumen emulsion used in the present invention is a bitumen emulsion containing water and other additives (e.g. decomposition regulator, surfactant, etc.). It is desirable to use it as it is without adding it, but if you mix all the required amounts with respect to the specified amount of aggregate components, it will be easy to mix, the resulting mixture will have slump properties, and will have good workability. In addition, the amount of binder relative to the aggregate component is appropriate, and the concentration should be 40 to 62% by weight of non-volatile matter (60 to 38% by weight of water), taking into account the decomposition and hardening time of the mixture, the properties after hardening, etc. , is usually adjusted within the range of 42 to 60% by weight. -! In addition, the reactivity with aggregate components, decomposition time, etc. change depending on the season, usage conditions, etc., so they are adjusted accordingly. Bituminous emulsions can be made by adding water, etc. to a high concentration emulsion, by mixing a low concentration emulsion with a high concentration emulsion, or by making an emulsion with a specified concentration from the beginning. Can be supplied.

The blending ratio of the bitumen emulsion to the aggregate component can be determined, for example, in accordance with the blending design used for slurry seals. That is, it can be determined by conducting two test methods such as flow cone method, penetration amount measurement, water immersion wear test, wheel test, and sand adsorption test.

Table 2 shows the total amount of bituminous emulsion relative to the aggregate components.
Based on the aggregate components of fine-grained type, coarse-grained type A, and coarse-grained B pear in %, and 1
It is about 2 to 14% by weight (all percentages are outside).

An example of a method for producing a bituminous emulsion mixture is as follows.

Aggregates dried and classified in an asphalt plant dryer 7 are mixed in the particle size range shown in Table 2, and 2% by weight (%) of ordinary Portland cement is added and mixed to form an aggregate component. residue 43-4
4% by weight, penetration of evaporation residue 60-70, softening point 56
Rapid hardening bituminous emulsion for cationic mixing at ~58°C (trade name
Pacsol (manufactured by Nippon Kagaku Kogyo ■) was used as a bituminous emulsion component.

A bituminous emulsion mixture using fine-grained aggregate was prepared by adding 10 Kgff1 of the bitumen emulsion component to 35 Ky of the fine-grained aggregate component and mixing with stirring. Fine aggregate component 3.5Kf
and bituminous emulsion component 1. OK9 and T are packaged in separate containers and set as a set, fine-grained lomenoku-chi (trade name, manufactured by Nichirei Kagaku Kogyo ■).

-! In addition, the bituminous emulsion mixture using coarse-grained aggregate is coarse-grained A
For mold aggregate component 52Kp, bituminous emulsion component 10 to 9;
For 60 kg of coarse type B aggregate component, bituminous emulsion component IQ
K9't were each stirred and mixed to prepare a product. Coarse type A aggregate components 5.2 to 9 and bituminous emulsion components 1. A set of OKv and OKv in a separate container is a coarse-grain type mouth patch (trade name, manufactured by Nichire Chemical Industry ■).

Next, an outline of the repair method according to the present invention will be explained with reference to the drawings.

Figure 1 shows the state after excavating and removing the existing foreclosure around the manhole. FIG. 2 is a vertical cross-sectional view of the manhole shown in FIG. In the figure, (1) is the existing 'e
The blue equipment is equipped with a manhole (2). The manhole (2) has a metal receiving frame (5) supported on the upper part of the manhole body (3) via an annular adjustment concrete (4)', and a manhole cover (6) is supported on the receiving frame (5).
) is provided so that it can be opened and closed freely. (The force shows the part where the existing bituminous pavement (1) around the manhole was excavated and removed. When repairing, if there is no abnormality in the conditioned concrete (4) and receiving frame (5), it is fine to leave them as they are, but if there is an abnormality in the surface height of the receiving frame (5), the receiving frame (5) If there is any wobbling, install height adjustment bolts and other bolts around the base of the receiving frame (5) and use them all to make adjustments.By making adjustments, the adjusted concrete (4
) and the receiving frame (5) are filled with a cement-concrete mixture. Also, adjusted concrete (4)
If the concrete is cracked and damaged due to stress, it is best to replace the conditioned concrete (4) with a new one.

FIG. 2 is a longitudinal sectional view showing the state of the existing bituminous pavement around the manhole shown in FIG. 1 after being excavated and removed and repaired, and FIG. 3 is a plan view thereof. In the figure, (8) is a cement concrete 1.1-metal mixture, which is poured in the area (7) where the existing 'e blue front equipment body around the manhole has been excavated and removed. The pouring is approximately 10 to 20 tM above the surface height of the manhole (2).
This is done to a position as low as R.

(9) is a green emulsion mixture using coarse-grained aggregate,
It is placed on the top surface of the cement-concrete mixture (8), and is shaped by rolling the cement using a means such as pressing with a metal trowel. The finishing is done in accordance with the surface height position of the manhole (2). fiQl is a bituminous emulsion mixture using fine-grained aggregate, and is applied over the top surface of the bituminous emulsion mixture (9) using coarse-grained aggregate and the adjacent top surface of the existing bituminous pavement. For example, the dust is pressed and shaped by means such as pressing with a metal trowel.

Its finished thickness is approximately 5W, and a sliding portion is provided on its peripheral edge. Fine sand is immediately sprinkled on the top surface of the surface treatment layer, if necessary.

Is spreading fine sand open to traffic? Effective for speeding up.

(Example) Examples of the present invention will be described below.

[Materials used]

(1) Cement: Gient cement (manufactured by Onoda Cement (Nanashimi)) Specific gravity = 3.00 (2) Gravel: Commercially available grain size = 25 gourd or less Specific gravity = 2.55 (3) Sand; City Sales product ratio weight = 2.55 (4) Water; tap water (5) Coarse-grained aggregate sound! Emulsion mixture: Coarse-grained lomenbatchi (manufactured by Nichirei Kagaku Kogyo ■) 13 or less aggregate components and ultra-fast hardening bituminous emulsion packed in separate containers.

Bituminous emulsion mixture used on fine-grained aggregate; Fine-grained Kuchimenbatch (manufactured by Nichirei Kagaku Kogyo@) Aggregate components of 5 or less diameter and ultra-fast hardening bituminous emulsion are packed in separate containers.

M Diameter: 60 cm Average width of the paving body located outside the receiving frame in Nomanhole: 20α (Fig. 1 W), depth: approximately 15 cm! Excavate and remove L* with a precursor at a rate of n (H in Figure 1). Therefore, the height of the manhole was adjusted using an adjustment bolt provided on the main frame, and the gap between the receiving frame and the adjusted concrete created by this adjustment was filled with a jet cement concrete mixture. Thereafter, a jet cement mixture was poured into the area where the existing power source front equipment had been excavated and removed, approximately 10 degrees lower than the surface height of all the manholes. The amount of jet cement concrete mixture used at this time was 120:9, and the blending ratio and blending quantity of each material are as shown in Table 3.

Table-3 Mixture and Usage of Jet Cement/Concrete Mixture Mixture of Jet Cement/Concrete Mixture Quantity of Jet Cement/Concrete Mixture However, the density of the jet cement/concrete mixture is 2.035.
The loss rate is 19ch.

The jet cement concrete mixture was manufactured using a 200Kp 9 mortar mixer mounted on a 4-ton truck. First, the sand and jet cement were mixed for about 20 seconds, and once they were well mixed, water was added to 1/2 of the total amount used. Add and mix to make a paste and make a slightly soft mixture.
Next, while adding and mixing gravel, 1/2 of the remaining amount of water and gold was added and mixed for about 15 seconds to produce the product. The produced jet cement concrete mixture was immediately mixed and discharged, and poured into the excavated area using a shovel or the like.

Next, coarse-grain lomen batch? A coarse aggregate bituminous emulsion mixture was prepared using That is, the maximum particle size is 13w without weighing.
A predetermined amount of the aggregate component under the tji is packed in the bag,
A predetermined amount of bituminous emulsion as a binder was added to the aggregate component, which was separately packed, and the bag was mixed by shaking for about 10 seconds. The produced coarse-grained aggregate bituminous emulsion mixture was immediately discharged onto the upper surface of the previously cast jet cement concrete mixture layer, and was finished by being rolled to the level of the manhole using a metal trowel. Finished thickness is approximately 1
crn, and three sets of coarse grain batches (approximately 6.2 in 9 pieces) were used. Furthermore, on this upper surface, the maximum particle size is 5. A fine-grained aggregate-bituminous mixture was produced in the same manner as the coarse-grained aggregate-bituminous mixture was produced using the following fine-grained concrete, immediately discharged from the bag, and used as part of the existing pavement. (Fig. 2 W') As shown in Fig. 3, a square (1-37F
IX1-3=F+) was rolled and shaped to provide a surface treatment layer of approximately 5-. Note that each edge of the surface treatment layer was finished by rubbing. The fine-grained Kuchimen batch (4,5K) used for this
Ij input υ) was 6 sets. After construction, fine sand (Romen Sand) was spread and the area was opened to traffic 20 minutes later.

In addition, the same effect can be obtained by immediately stirring and mixing the aggregate component and bitumen emulsion component without packing the aggregate component and the bituminous emulsion component as a fine-grained aggregate bitumen mixture or a coarse-grained aggregate bituminous mixture. Ta.

(Example 2.3.4.5.6) It was carried out in exactly the same manner as in Example 1, but the amounts of each material used were as follows.

↓ In all of the above examples, the repaired area was located in an urban area within the department where there is a considerable amount of traffic for large vehicles, but is it still in good condition approximately one year after the repair? I keep it.

〔Effect of the invention〕

Now, the effects of the present invention will be described.

]) Is there a cement-concrete mixture in the area where the pavement around the manhole was excavated and removed? Because it is poured, it is about 10 times stronger than asphalt composite material around manholes. It can be solidified, has high resistance to passing traffic, and does not cause subsidence. Note that when jet cement is used as cement, it is effective because the hardening time of the cement-concrete mixture is shortened.

2) Furthermore, a bituminous emulsion mixture layer is applied on the top surface of the poured cement-concrete mixture layer, which prevents water evaporation from the cement-concrete mixture and facilitates its hardening, preventing initial cracking and increasing initial strength. It has effects such as prevention of expression and freezing. Furthermore, since the surface, the part of the surface of the existing pavement, and the part of the surface of the existing pavement are surface-treated with a bitumen emulsion mixture layer, the existing pavement, the repaired part, the manhole, etc. are integrated into one. The structure can be used for traffic in a short period of time, and since the entire area around the manhole has been repaired in a durable manner with no steps, the effect of protecting the manhole itself is extremely large.

3) Since it is constructed at room temperature, it is possible to manufacture and use only the amount actually used, so there is no waste of materials unlike heated asphalt mixtures. As shown in the example, if a predetermined amount of aggregate components, a predetermined amount of bituminous emulsion, and gold powder are stored in separate containers, and the required amounts are mixed on site, the need for measuring can be reduced. It is extremely effective because a blue emulsion mixture can be easily produced.

Also, since it is installed at room temperature, there is no need to worry about burns.

4) Furthermore, compared to the conventional construction method using a heated asphalt mixture, there are practical benefits such as less equipment is used and the area occupied by the road is smaller.

[Brief explanation of drawings]

The figures show examples of the present invention. Figure 1 is a vertical cross-sectional view of the manhole and its surrounding area, showing the state in which the existing source green pavement metal has been excavated and removed around the manhole, and Figure 2 is a vertical cross-sectional view of the manhole and its surrounding area. A vertical cross-sectional view showing the state in which the entire excavated and removed part of the existing source equipment pavement around the manhole in Figure 1 has been repaired.
FIG. 3 is a plan view of FIG. 2. An explanation of all the symbols in the figure is as follows. (1) is the existing bituminous pavement (2) is the manhole (3)
) is the manhole body (4) is the adjusted concrete (
5) is the receiving frame (6) is the manhole cover (7)
) is the excavated and removed portion of the existing bituminous pavement around the manhole (8) is a cement-concrete mixture.

Claims (1)

[Claims] The bituminous pavement (hereinafter referred to as pavement) around the existing manhole is excavated and removed, a cement-concrete mixture is cast in the removed area at a level lower than the height of the manhole to fix the manhole, and then coarse aggregate is used. The bitumen emulsion mixture that had been prepared was paved and shaped to the height of the manhole, and the top surface and the adjacent top surface of the existing pavement were then surface-treated with a bituminous emulsion mixture using fine-grained aggregate, and the existing pavement was paved and shaped. A method for repairing areas around manholes, etc., which is characterized by integrating and solidifying the body, repair part, manhole, etc.